Research on the Influence Factors of the Interfacial Crack Propagation Behavior of Thermal Spraying Parts
WEN Feijuan1,2, DONG Lihong2, WAND Haidou2, LYU Zhenlin1, DI Yuelan2
1 School of Materials Science and Engineering, Xi’an University of Technology, Xi’an 710048; 2 National Key Laboratory for Remanufacturing, Academy of Armored Forces Engineering, Beijing 100072
Abstract: Thermal spraying technology has been widely used in improving the life of components, but the existence of interface cracks has an obvious effect on the life of parts. In this paper, the effects of residual stress, coating thickness and initial crack length on the interface crack propagation were studied by using the finite element method. The result showed that the increase of residual compressive stress leaded to the decrease of the critical load and the increase of the phase angle of the crack tip, which was more likely to have the interface crack. The increase of residual stress could result in the increase of critical load and the decrease of the stress phase angle of the crack tip, which was more prone to generate cracks perpendicular to the interface. At the same time, the interface crack in the thick coating was the main crack mode, and was mainly shear failure. Thin coating was easy to produce cracks perpendicular to the interface, with tensile failure as the leading. The longer the initial crack length, the more prone to peeling of the coating and the substrate, resulting in failure of the coating. The three point bending test was used to verify the crack with different initial length, and the experimental results were similar to the finite element simulation results, which verified the correctness of the finite element simulation, and provided a scientific basis and theoretical basis for the accurate control of the interface crack propagation of the thermal spraying parts.
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2018, Vol. 32 
